Bag-machine.



No. 656,340. Patented Aug. 2|, I900.

H. BILGRAM.

BAG MACHINE.

(Application filed Dec. 22, 1899.) v (No Model.) y 3 Shear-sheaf llll.

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. Patented Aug: 2|, I900. n. BILGRAM.

BAG MACH IN E.

(Application filed Dec. 22, 1899.)

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No. 656.340. Patented Aug. 2|, I900.

u. BILGRAM. BAG MACHINE.

(Application filed Dec. 22, 1899.) (No Model.) 3 Sheets-Sheet 3.

I Inventor:

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UNITED f' STATES PATENT OFFICE.

HUGO BILGRAM, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE EASTERNPAPER BAG COMPANY, OF CONNECTICUT.

BAG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 656,340, dated August21, 1900. Application filed December 22, 1899. Serial Flo-741,216. (Nomodel.)

machines; and it consists of certain improvements which are fully setforth in the following specification and are shown in the accompanyingdrawings.

In the formation of the bottoms of paper bags in that class of machinesin which the bottom of the paper tube is first op'ened out into a squareor box shape and is then drawn out into a flattened condition, asdescribed in Letters Patent No. 634,102, dated the 3d day of October,1899, much difficulty has been experienced in flattening down the sidesfrom the square box shape. In the patent referred to the bottom is firstformed into the square box shape by the action of movable sectionalsuction-formers, and these formers are finally opened out to draw thepaper down into a flattened condition to receive the pasting andfinal-folding-operations. To assist the formers in thus drawing out thepaper into the flattened shape, folding-wings have been employed adaptedto act upon the sides of the paper and fold it inward as the formers areopened out. Such folding-wings are shown in the Patent No. 634,102,above referred to, and also more particularly in ,Patent No. 634,099,dated October 3, 1899. My improvements are particularly designed for usewith a machine of the general character shown in these two patents andare adapted to insure a more perfect folding in of the sides of thepaper as it is drawn from the square box shape into the flattenedcondition and to thoroughly flatten out the paper and avoid theformation of wrinkles or imperfect folds. I do not mean, however, tolimit my invention to machines of the exact character described in thepatents referred to, as it may be used with other machines where similaroperations are to be performed in the formation of a bagbottom.

In the accompanying drawings, Figure 1 is View of the mainflattening-plate.

a plan view of my improved fiattenin g devices for bottom-formers ofpaper-bag machines. Fig. 2 is a sectional view on the line c 00 ofFig. 1. Fig. 3 is a sectional view on the line y y of Fig. 1. Fig. 4 isa front elevation of the flattening devices. Fig. 5 is a perspectiveFig. 6 is a longitudinal vertical sectional view of the bottom-formersand flattening-plate, illustrating the operation thereof. Figs. 7 and 8are horizontal sectional views on the line 2 z of Fig. 6, illustratingthe operation at different periods. Figs. 9 and 10 are perspective viewsof a paper-bag section,illustrating steps in the formation of thebag-bottom. Fig. 11 is a view similar to Fig. 6, showing thebottomformers partially opened;.and Fig. 12 is a perspective view of oneof the guiding-fingers.

1 1 are portions of the side frames of the machine.

2 is a cross-frame between the side frames by which'thebottom-flattening devices are carried.

3 is a flat plate carried by a stud 4, support ed and guided in a guide5 on the frame 2 and normally held in a projected or forward position byaspring 6. The general shape of the plate 3 is made to conform to thegeneral shape of the flattened bag-bottom, but this is not essential.The notch 7 in the base of the plate is provided for the gripper 8 ofthe stripping roll 9, by which the bag-section after the partially-formed bag-bottom has been flattened out is stripped off from theformers and carried to the final-folding and pasting devices. The sidesof the plate 3 are notched, as at 10 10, and in these notches are fittedfingers 11 11, having inclined or curved faces 12 12, normallyprojecting beyond the plane of the face of the plate 3. The fingers 1111 are carried by independent studs 13 13, guided in guides 1 14 of theframe 2 and normally projected by springs 15 l5,thus having freedom ofmovement with respect to the plate 3. The outer extremities of theinclined face 12 12 of the fingers 11 11 are provided with heads 16 16for the purpose hereinafter described.

17 17 are the suction-formers by which the paper tube 1) is carried andby which its end is opened and folded, as set forth in the LettersPatent referred to.

The operation of these devices is as follows: As the formers carryingthe paper-bag section move forward and open up the partially-formedbottom is drawn out by the formers from the square box shape shown inFig. 9 into a flattened form substantially as shown in Fig. 10. Thisoperation necessitates the accurate folding inward of the sides a a, andas the formers reach approximately the limit of their forward movementthe sides a aof the paper come in contact with the inclined faces 12 12of the fingers 11 11 and are guided inwardly, so as to be accuratelyfolded down into the form shown. Before this operation is completed theframes of the formers strike the extremities 16 16 of the fingers 11 11,as shown in Fig.8, and push them backward, and immediately thereafterthe opened faces of the formers come in contact with the face of theplate 3, as shown in Fig. 7, and the bag-bottom now in the form shown inFig. 10 is flattened out by the pressure between the opened faces of theformers and the face of the plate 3, the latter yielding slightly toprevent jar or injury under the action of the spring 6. As the formersstart to move back, the paper is released from be tween the face of theplate 3 and the faces of the formers and is strippedoff by thestripping-roll 9. The fingers 11 11 are prevented from moving forwardand clamping the paper by the projecting heads 16 16, which are beyondthe sides of the paper and make contact with the frame of the formers,as shown in Fig. 8, thus leaving the paper entirely free to be drawn offby the roll '9.

The details of construction shown may be varied without departing fromthe invention.

What I claim as new, and desire to secure by Letters Patent, is asfollows:

1. In flattening devices for bottom-formers of paper-bag machines, thecombination of a flattening-plate against which the paper is adapted tobe pressed, with guiding-fingers arranged at the sides thereof andadapted to guide the projecting edges of the paper down upon said plate.

2. In flattening devices for bottom-formers of paper-bag machines, thecombination of a flattening-plate against which the paper is adapted tobe pressed, with guiding-fingers having inwardly-inclined faces arrangedat the sides thereof and adapted to guide the projecting edges of thepaper down upon said late.

p 3. In flattening devices for bottom-formers of paper-bag machines,thecombination of a flattening-plate against which the paper is adapted tobe pressed, with independentlyyielding guiding-fingers arranged at thesides thereof and adapted to guide the projecting edges of the paperdown upon said plate.

4:. In flattening devices for bottom-formers of paper-bag machines, thecombination of a flattening-plate against which the partiallyformedbottom of the bag is adapted to be pressed, with independently-yieldingguiding-fingers arranged at the sides thereof and havinginwardly-inclined faces 12 and projecting heads 16, substantially as andfor the purpose described.

5. The combination with the flat yielding plate 3, of theindependently-yielding guiding-fingers 11, 11, arranged at the sidesthereof, substantially as and for the purposes described.

6. The combination with the flat yielding plate 3, of theindependently-yielding guiding-fingers 11, 11, arranged at the sidesthereof and provided with inclined faces 12 and projecting heads 16,substantially as and for the purposes described.

In testimony of which invention I have hereunto set my hand.

HUGO BILGRAM. Witnesses:

ISAAC THOMPSON, J. ROLLIN PARKER.

